<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>

<body>
<h3 id="hh">hello 中文</h3>

<!-- 第二种 在网页script标签直接编写代码 -->
<script>
    let h3 = document.getElementById('hh')
    h3.style.color = 'red'
</script>
</body>
</html>
